Improvemenf in grinding-plates



UNITED STATES PATENT OEEIcE.

EDMUND S. HOWLAND, OF BATAVIA, ILLINOIS.

IMPROVEMENT IN GRlNDlNG-PLATES.

Specification forming part of Letters Patent No. 113,433, dated April 4, 1871.

To all whom it 'may concern:

Be it known that I, EDMUND S. HOWLAND, of Batavia, in the county of Kane and State of Illinois, have invented a new and useful Improvement in Metallic Feed-Mill Grinding- Surfaces; and I do hereby declare the following to be a full, clear, and exact description thereof, which will enable others skilled in the art to which my invention appertains to make and use the same, reference being had to the accompanying drawing, forming part of this specification, in which- Figure lis a top View of my invention, showing the iiuted surfaces thereof; and Fig. 2is a vertical central section ofthe same.

. Similar letters of reference indicate corresponding parts in both gures of the drawing.

My invention relates to that class of metallic mills used for grinding feed 5 and theimprovement consists in providing the grinding-surface of the rings with a series of curvilineal projections, extending from the inner side of the rings outward to a point near its periphery, the curved or working sides of which are provided with a series of furrows, which extend across their periphery at a right angle to the line of their center, by which the grain is mashed and forced outward to the outer grindl ing-surface of the ring.

In the drawing, A represents the rin g proper, which may be of any desired size to fit the mill within which it is to be used, having its surface beveled from a point near its periphery inward toward its center and furrowed in the or` dinary manner.

Theouter surface of the ring is made Hat, and is provided with a system of furrows iinel y graduated, the lines of which extend inward y toward the center or axis of the ring.

Upon the beveled surface of the ring is formed a series of curvilineal projections, B, which are so arranged as to bring their bearin g-surfaces on a level with the outer furrowed surface of the ring. The front or curved portion of said projections which come in direct contact with the grain are also iinely furrowed,

the lines of which extend across the periphery of the curve. Said projections are cast solid upon the ring, and their positions arranged oblique to the line of their diameter, by which a centrifuga-l movement :is imparted to the grain.

In the drawing it will be noticed that but one ring is shown; but in all cases two are eniployed, being of the same general form, one of which is secured in a fixed position, the other being inverted and so arranged as to revolve, thus bringing the grinding-surfaces in contact with the grain, by which means the grain is forced t0 the outer grindingsurface of the rings bythe action of the projections,

EDMUND S. HOWLAND. Witnesses:

N. C. GRIDLEY, N. H. SHERBURNE. 

